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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b43552c1efb05713bf5b61db6a0d1cb0b7fc802d8ef5ec0026e416fcdd3e49' 
  AND token = '9nrxzdBAzkIoKYX298Kq4YVjXLiJp3K/lf6aq5tx87k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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