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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026453eec34287feeb9b17afb853fbf8eddfa7f3b9d8a334497a81eb10ac1190' 
  AND token = 'QLuY4VUBmxCbEZHXYb2I4+EbnUPaY+wa9xsmHg8Ywo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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