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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4698809a1233ad31e881ef945ad9a99ec8f20e3f51941cd2fbbbba15d0ba6d' 
  AND token = 'qHJ9sHKyikg1nUN8nuHr9VnCePq3mz0SYPUbmG9C1Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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