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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557b03d7aadde8254ef5d358570bae8de714302b6d478879b5b936ec80ba5373' 
  AND token = 'cACZJeBOWW3xvJCQlrrcrxStbk83/+TCKD66PzmUoYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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