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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef20a1325091455f53ac73ea0dd1ab98b155fb057c25f4304c6dbd8e37c8f257' 
  AND token = 'FrPDSQ7Dbxs0NQ/Jpb4lKM4cB4EnpU4y1kjYnv3C1Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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