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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6884e7dd82d72e8fc0f2fa5d8fd40044d6215fd2cd486417ee45db0538ebf27' 
  AND token = 'OWHPAXch2r2rg/RcAephCxexi/y/VKWhuqwP2rOx8ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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