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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8464dd2dc0275d8f05fbf39e6324e0da3ce0cb2f58da9bd89b03a9a7ec54268c' 
  AND token = '4cs+i8QjhLH/9YWd1Ddpr7QcLc3F56G4fAKvnH7vIXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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