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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a05fa2f3e6768d5db8ee4825cc94f90c05c12d9bafbce49cfb0da506e66f16' 
  AND token = '1URlvtIiDv4ph2zpY9eZPPgDI98WUEksZnXOyXcIYok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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