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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9af5a4c37bfa79df646a4a1060a098a10efbfeeaf9bafa5c2d39f14086269f3' 
  AND token = 'cadxvBmzfY9CxjEHI2iUwJzmc0QnGXWzARqdr9/tu5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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