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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc6666a85c8b2a4b4eb62e2be0813869812ea96459300c137892feba60666fc' 
  AND token = 'PbKk1LDgp/q63cxybe9Cvi85O4m7Gg3lKmYs09S0cwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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