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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ecd3bee3902e39a9a894f279d104a6c02cb02924d411382f66219ef2cf4e88c' 
  AND token = 'LgI2rrEmxMfU+kV2oujdRbEnXUkCYrry+O0la/1UuIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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