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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2faea4552307986834d5b5450eeb9d821ba771f5f32ae99c6643a6b12858055d' 
  AND token = 'EZPrQKGr0Ivxl5TaWrRMfeOuJCLS1jLrWzw+dlrfb+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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