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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9c11aabdf0f19d98dd2df0d3913956c46cf83073ee7d7dfb9a14bdf75c04ed' 
  AND token = '+bUCxw2eBjYtogCj7HWYPIclkLUzdcIdxixMm4NwOaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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