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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05fd354e1f29cf599f0c2ccd39ad791eda7f1aad6afb77178ff927b4c076aa00' 
  AND token = 'nKP3yDhbc9UlntCCgUzFNmy/8blqa8y9RAO1NAnr0lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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