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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3055a83250a2e5ad7c474f8d6b5d71c567861007e7ea036dc6776fcfec61b2ab' 
  AND token = 'p1oIc4qLJZQrmqARwx8fRFdZ5A/kqNSVMbAaU1P02LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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