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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb09345bdafe7d236d4ec6c86d1397fdcd8b25daad6809d85e4b4e60106dd41c' 
  AND token = 'NL/xiCcijBCYP+td0Ye3Cwrpm8/qIO5IfkOK054rht4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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