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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2b55c6dd3ee9c7e2d21a6d54dc27d2c6aed72d59f71d5600f557cca3ffd75d' 
  AND token = 'MMdWDe50IqZfNTjPA/l2wX3bLFI7qtc2DdtnE9L7h8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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