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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb970744fa89f784c7b8992176ea651ad5b01abe275cc8786fa62b05458c9d5' 
  AND token = 'EOhzz4dWb9uWTs7Yj0u/LaGUMwgI8WxRMyJP9j5yLeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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