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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679ef343fd44a437251065fae482de7704839da8f55d9f3073cfa6d9d0fadd8e' 
  AND token = '4tFVKqcXKnL2ErVK9tnigCW5twzw2hqThKF49bE2tyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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