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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155e051dbe4049e59b02dcc9b1e9a1ec066705c2cce1e1e719269e9aabe6f717' 
  AND token = 'Is7Vli2glSLRvuG6ef0cMtPzeLum2MaZT4ki3DxlROw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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