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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fadbe57cba347c8f34ab4cd7fe9d2ad844aba5cddecb7c39e55a3cfe9a1faaa' 
  AND token = 'wZLbbiCmJM2z1I7hmpOaj/X0NqmvdnyS71lxqWdVCnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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