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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d52c8bf26a976431b8dc9daa7e56f67dbe0d00d2ae3e44cd83797a766f35fbd' 
  AND token = 'I0lxtptZqORR4+Kw4KDI4DPZq/kQD8zuxdky6y47NyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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