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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec76fa9452be92abb5234d7db96ada1d1c2c2242dc4650af688b5efa2dd17711' 
  AND token = 'tEpm4nEnH2DTc+1eSlNjgK6Tx+m3nSnfv6y50O2zA0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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