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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b038d2158731b8cfdbb6abe4ed8e998f5c40287c885c6febed6db7a090a02220' 
  AND token = 'puT7XKj6WQC9+N48Pokl4WlKrbPXblPZQHd3Jn80gaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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