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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e133453ff41a89c1987e68370ce430e783b75b9e23ebb795dacf1ecd0903b40' 
  AND token = 'PEmnxR5FFp60UymOk2x/w/+VMcwNHNYkKote8h+1E1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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