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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeda308a6ab68fdc69adfaf98cc0dbe3d7532e4505e0a2556d6d332f6fd87891' 
  AND token = '0j2z+BenUJUQBX5JFBjZNaAMJz/5JxQ+pv7S+Es5vOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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