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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1eb67e3326b7a037bc471bb153978d4c12209ea48878890e16c696a20d76d7' 
  AND token = 'Kf/fsdGG7/I4Eo4EoSD2Dpml6506SDp9ixn2NC+IymM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}