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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5446d58424a673680da1fb3d090f9dcb38da6f42db12e63772a56823944b3c7' 
  AND token = '8Pi0Pl5qNZHMT5vuQJEcxuV4sIyj4lwr2z4PineMjv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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