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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c213b50c7cea3232c08631d9b0c0357396127a964eaa960b9e7fc61586544c' 
  AND token = 'sG4fs0gMkmoMhXP3gMxt4oP9y2xxQiQqIlRB5eSZGu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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