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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1217e766ab8142832bb77685e03b09d0fbcdb37a6635e05d561bca898e741be' 
  AND token = 'H0B8RNLqAArzSNgTVBWE7I0MU39HzjH5Qb1c6+8e9Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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