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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f72daa76b26ea6e94157b8503b88f5ff5c3adf107804b3cb7267d2a871eb00' 
  AND token = '4RBuc6u1qSVLX3i7antG3cPtVU/hLds5jX1UYObscXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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