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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8232d760c88ab86afc44c7fae9dc10877f8c63cd4ae49a17e6053101883fa8ce' 
  AND token = '6Gm0cqeD80Y3qgBkkX/EMYQNTAalqobVUuBcomaQ930=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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