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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a3e7ce2f3b7ae6f01e439390dafee333eff7cb84fc0e3d8179fe0a1dc874d1' 
  AND token = 'TZhg1eGRofXCqiVpoWH3JWiH4gf6rF7yQkWeVyDnnK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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