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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb2a1d7411b149fd227ac6ebb695a027e83f78b3d67f93f7b7446a74f074d03' 
  AND token = 'X5tXuhL4TR+qcBoAb1iip0I33x2tG8W5GQNnRDI5sus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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