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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8355a2f99b6eda19e9bce8bbcd3d6faef2201dad903124ad34a721397f7dbb' 
  AND token = 'WOWSAizKbPSlDab/R4EtBdpOmp+MgULr5un6CG2HS3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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