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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98709220461365fdd0267f098a810f94a9da20b4813c360f0436bed4e89a3db' 
  AND token = 'cXTx60OXAXed5Qx2L7EzcRoZVQzL0mZS3GsUx0Pje+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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