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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8197efbc859b5f6b946f27f47aa9c4d585aff0afe54e172c4754c3ed63c87902' 
  AND token = 'KvEbcKSkZdOi6Hl+I3xlUQlQcyx6ED/kVmVQRnC6zYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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