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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4d19431d5d3689e717c0421eea48388c3addd2aafbfe8ad1ee3d4a305e0858' 
  AND token = '/PSb3dzS/ItrBU9yCnCepJ4/OnzR9g8dWSwbi4VGBHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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