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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7a638c724f3d2794c00c9ac5ec282ff159ed9e995247139d2a10f38dbcbf50' 
  AND token = 'VatslvtsU67mS5gfXz77bJqpSaCURqpuKjNtYr2K1r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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