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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a3ca2000e1f7262f6cb858b4dc62f0567218f970bf1208e12b9fed2073eeb4' 
  AND token = '7J0dEOY5/+Z88I6TZrcgkl9xcgdHPm+BAvyxW5qIQGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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