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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec456623031f825a5c8ee093852c9531da3478baf326882346e17406b3d50d27' 
  AND token = 'F4c7gWLw8yDajdKk7R5fjU9jgE+o4oLNjfG9LSbmWSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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