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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff54a1b06065ff05cc0ec1feee1613e0bbad67f6e4e35dca3b14388bdf53743' 
  AND token = 'NRiRxV+6x6sKCNUfCL6J5sXX7Y/W14RaeIBSacfltwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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