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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcee32e04150886a2a977f32df998db84b28c6e24d6077797c8830d818d2172' 
  AND token = 'Mrm/WFsS+kGYU8ZM0KRSlBbbJNnsGkslH4ZoOT6/CgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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