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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62457b7c671a32d6b3b2542701803bbb61a42bf27881ff778409dce49e3abd07' 
  AND token = 's8irO+fB8z8sFRiCY9B+gYMog7JZAp81nDw0JggOl9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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