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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ca25fd8af751d248a8c367805a5f9a926a77711db87bf2bf7c8a2dfdbb3af3' 
  AND token = 'bnoGs4xOq7e41aQC417uO1vBrmcItNLs00Fm8dn1yEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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