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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f3d2834a16100ca96157e3a38c4bb55955e5caf8e2345680c536a3854f4b05' 
  AND token = '6E2YxClwhFBn+rTmdIdBV2l/iqnR81LMHAQqmvxtMRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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