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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ba8de2dbef8c87155bc8615d0bb5865a612a0ddcc04398914ee869600f0beb' 
  AND token = 'QSAGeSwZNDTyJ9BEFW7Qs9RcGLIWhQZ7tt35CPS6efw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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