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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a57b61515630dc084641f3b8dd6301ee764f1bffe5f3a02067b5cb6d845b99' 
  AND token = 'FtDUn8krQuDSkSUsxiIaf+nECuCXmbeVXDNHhsM7+44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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