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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236f82a1c69e3f4d06cb191eb1e07c181f0d370dbc8bc52514a87b7c5399dc5f' 
  AND token = 'M0wSCb8DfBXbxUO5Z/HfO2Ib0UKR2o79rOEBlS0EFMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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