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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656697f4ca9c1afb92e61ffc5887a2fbfa301a9fca9f7efa629f7173f40b3b1b' 
  AND token = '68wyJWtOHWpn5acxdzRgN6p01N9n07k227fmomx3ub8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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