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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69092fd59b2db1874cdc7c0820f987ec3b0669e85d134e0eaaf9b19838db1bb7' 
  AND token = 'OAm/VE7zqEuVT4j3ih9rdMl9ge0uYXrQJtOl50cxGho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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