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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5577da6649ea35c2827ce933658ced2999b0a51fb6f46a3243520e4c077e6ef0' 
  AND token = 'oyc0bNSmvq3llfyvayAy/5CsFIStiF80ydK2nw3zygQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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