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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170f7f2cc48efd34ed42242aa65c0f968de1915cf181d2f6722df5898c549805' 
  AND token = 'ULdyxXs9Blp1ophqg3s7p73T/QtHwbI3WQX3p7GdPIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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