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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b0ffac732069d99b8871bcc61ce7cadafd5dc159602b1b75ceb0069539fecc' 
  AND token = 'PSwQ8xsp5fpqg1e379W5lMY7lP6QoeQ0FY+Xxk5f4uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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