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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570db706a1fc5d9dc4ad3e526b93c32f066cfd2296b962171ad7f6981c000b08' 
  AND token = '2ERS/NFJ+t5FLfJh7EeBUvB87aR8tgUcxll0+eeCb4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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