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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02662a10fc8c8e84b6936251dfc9272780a80d029411c0cd152d1812dcd8b6b7' 
  AND token = 'aK+IKzDOfvswU1S5WFp/UWJAoL2ikadd0/r6fKhQh3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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